Building My Own POS System in Java Swing - From UI to Database

A comprehensive Point of Sale Management Application developed using Java Swing, based on the MVC + UI Layered architecture. The application includes fully functional modules for managing products, invoices, customers, employees, stock, and more — designed with modularity and extensibility in mind.

🧰 Technologies & Development Environment

💻 System Requirements

• ☕ Java JDK 17 or higher (Java 21+ recommended)
• 💡 NetBeans 15+ or IntelliJ with Swing support
• 🛢️ MySQL Server 5.7+ or 8.x
• 🧑‍💻 Compatible with Windows / macOS / Linux

📁 Project Structure

pos_app/
├── dao/              # Data access layer (Database Access)
├── icons/            # UI icons (SVG/PNG)
├── models/           # Data models: Product, Invoice, Customer, ...
├── pictures/         # Static images for UI
├── sql/              # SQL files (schema & data)
├── ui.components/    # Reusable UI components: Button, Sidebar, Header,...
├── ui.dialog/        # Forms for data input/edit
├── ui.panel/         # Feature panels: Products, Invoices...
├── ui.table/         # Custom table renderers/editors
├── util/             # Utilities: DBConnection, IconUtil, ...
├── view/             # Main application frame (MainFrame.java)
└── test/             # Unit tests

📦 Dependencies

🖥️ Main Features

✅ Getting Started

1. Clone the repository:

git clone https://github.com/dangkhoa2004/pos_app.git

1. Open with IDE: 👉 Preferably NetBeans 25 or IntelliJ (pre-configured with Maven/Ant)
2. Setup MySQL database:

CREATE DATABASE pos_app CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;

Then import pos_app.sql from the /sql folder.

1. Configure DB in DBConnection.java:

private static final String URL = "jdbc:mysql://localhost:3306/pos_app";
   private static final String USER = "root";
   private static final String PASSWORD = ""; // Change to your password

1. Run MainFrame.java to launch the application.
2. Notes:
   • Add JDBC driver if ClassNotFoundException occurs
   • Use UTF-8 for proper Vietnamese character display

📌 Development Notes

• All icons are in icons/ as scalable SVGs
• To add new feature → Create Panel in ui.panel → Register via SideBarMenu
• Under-construction features will show a JOptionPane message
• The project is extensible: PDF invoice, cloud sync, etc. ready for integration

📸 UI Screenshots

🌙 FlatLaf Dark Mode

⏳ Coming soon

☀️ FlatLaf Light Mode

⏳ Coming soon

🔮 Roadmap

• [ ] 🧾 Export invoice to PDF
• [ ] 📤 Google Sheets API integration
• [ ] 💾 Scheduled automatic backups
• [ ] 🔐 Advanced login & permission system
• [ ] ☁️ Firebase cloud sync (optional)

🤝 Contributing

We welcome contributions to improve this project!

• 🛠 Fork the repo
• 🌱 Create a branch: feature/
• 📥 Submit a detailed Pull Request

📚 Technical Docs

• 🧩 DB Schema & Sample Data:

CREATE DATABASE IF NOT EXISTS pos_app;
USE pos_app;

CREATE TABLE roles (
    id INT AUTO_INCREMENT PRIMARY KEY,
    name VARCHAR(50) NOT NULL
);

CREATE TABLE employees (
    id INT AUTO_INCREMENT PRIMARY KEY,
    name VARCHAR(100),
    username VARCHAR(50) UNIQUE,
    password VARCHAR(255),
    role_id INT,
    FOREIGN KEY (role_id) REFERENCES roles(id)
);

-- More tables...

View full SQL file

• 🧩 ER Diagram:

📜 License

This project is currently not published under an open license.

Please contact the author for permission if you'd like to use or redistribute the code.

👤 Author & Contact

• 👨‍💻 Author: Đăng Khoa
• 📧 Email: 04dkhoa04@gmail.com
• 💬 Facebook: Đăng Khoa
• ⭐ If you like this project, give it a star on GitHub!